C++ CCodeChainCtx::Discard方法代码示例

bool IDockScreenDisplay::EvalBool (const CString &sCode, bool *retbResult, CString *retsError)

//	EvalBool
//
//	Evaluates the given string

	{
	CCodeChainCtx Ctx;
	Ctx.SetScreen(m_pDockScreen);
	Ctx.SaveAndDefineSourceVar(m_pLocation);
	Ctx.SaveAndDefineDataVar(m_pData);

	char *pPos = sCode.GetPointer();
	ICCItem *pExp = Ctx.Link(sCode, 1, NULL);

	ICCItem *pResult = Ctx.Run(pExp);	//	LATER:Event
	Ctx.Discard(pExp);

	if (pResult->IsError())
		{
		*retsError = pResult->GetStringValue();
		Ctx.Discard(pResult);
		return false;
		}

	*retbResult = !pResult->IsNil();
	Ctx.Discard(pResult);

	return true;
	}

CSpaceObject *IDockScreenDisplay::EvalListSource (const CString &sString, CString *retsError)

//	EvalListSource
//
//	Returns the object from which we should display items

	{
	char *pPos = sString.GetPointer();

	//	See if we need to evaluate

	if (*pPos == '=')
		{
		CCodeChainCtx Ctx;
		Ctx.SetScreen(this);
		Ctx.SaveAndDefineSourceVar(m_pLocation);
		Ctx.SaveAndDefineDataVar(m_pData);

		ICCItem *pExp = Ctx.Link(sString, 1, NULL);

		ICCItem *pResult = Ctx.Run(pExp);	//	LATER:Event
		Ctx.Discard(pExp);

		if (pResult->IsError())
			{
			*retsError = pResult->GetStringValue();
			Ctx.Discard(pResult);
			return NULL;
			}

		//	Convert to an object pointer

		CSpaceObject *pSource;
		if (strEquals(pResult->GetStringValue(), DATA_FROM_PLAYER))
			pSource = m_pPlayer->GetShip();
		else if (strEquals(pResult->GetStringValue(), DATA_FROM_STATION)
				|| strEquals(pResult->GetStringValue(), DATA_FROM_SOURCE))
			pSource = m_pLocation;
		else
			pSource = Ctx.AsSpaceObject(pResult);

		Ctx.Discard(pResult);
		return pSource;
		}

	//	Otherwise, compare to constants

	else if (strEquals(sString, DATA_FROM_PLAYER))
		return m_pPlayer->GetShip();
	else
		return m_pLocation;
	}

COverlayType *CDeviceClass::FireGetOverlayType (CItemCtx &ItemCtx) const

//	FireGetOverlayType
//
//	Fire GetOverlayType event

	{
	SEventHandlerDesc Event;
	if (FindEventHandlerDeviceClass(evtGetOverlayType, &Event))
		{
		//	Setup arguments

		CCodeChainCtx Ctx;
		Ctx.SaveAndDefineSourceVar(ItemCtx.GetSource());
		Ctx.SaveAndDefineItemVar(ItemCtx);

		ICCItem *pResult = Ctx.Run(Event);

		DWORD dwUNID = 0;
		if (pResult->IsError())
			ItemCtx.GetSource()->ReportEventError(GET_OVERLAY_TYPE_EVENT, pResult);
		else if (!pResult->IsNil())
			dwUNID = pResult->GetIntegerValue();

		Ctx.Discard(pResult);

		//	Done

		return COverlayType::AsType(g_pUniverse->FindDesignType(dwUNID));
		}
	else
		return GetOverlayType();
	}

int CArmorClass::FireGetMaxHP (CItemCtx &ItemCtx, int iMaxHP) const

//	FireGetMaxHP
//
//	Fire GetMaxHP event

	{
	SEventHandlerDesc Event;
	if (FindEventHandlerArmorClass(evtGetMaxHP, &Event))
		{
		//	Setup arguments

		CCodeChainCtx Ctx;
		Ctx.SaveAndDefineSourceVar(ItemCtx.GetSource());
		Ctx.SaveAndDefineItemVar(ItemCtx);

		Ctx.DefineInteger(CONSTLIT("aMaxHP"), iMaxHP);

		ICCItem *pResult = Ctx.Run(Event);

		if (pResult->IsError())
			ItemCtx.GetSource()->ReportEventError(GET_MAX_HP_EVENT, pResult);
		else if (!pResult->IsNil())
			iMaxHP = Max(0, pResult->GetIntegerValue());

		Ctx.Discard(pResult);
		}

	return iMaxHP;
	}

ICCItem *CMission::FireOnReward (ICCItem *pData)

//	FireOnReward
//
//	Fire <OnReward>
//
//	Callers are responsible for discarding the result, if not NULL.

	{
	SEventHandlerDesc Event;

	if (FindEventHandler(EVENT_ON_REWARD, &Event))
		{
		CCodeChainCtx Ctx;

		Ctx.SaveAndDefineSourceVar(this);
		Ctx.SaveAndDefineDataVar(pData);

		ICCItem *pResult = Ctx.Run(Event);
		if (pResult->IsError())
			{
			ReportEventError(EVENT_ON_REWARD, pResult);
			Ctx.Discard(pResult);
			return NULL;
			}

		return pResult;
		}

	return NULL;
	}

void CEffectCreator::InitPainterParameters (CCreatePainterCtx &Ctx, IEffectPainter *pPainter)

//	InitPainterParameters
//
//	Initialize painter parameters

	{
	SEventHandlerDesc Event;
	if (FindEventHandlerEffectType(evtGetParameters, &Event))
		{
		CCodeChainCtx CCCtx;

		CCCtx.SaveAndDefineDataVar(Ctx.GetData());

		ICCItem *pResult = CCCtx.Run(Event);
		if (pResult->IsError())
			::kernelDebugLogMessage(CONSTLIT("EffectType %x GetParameters: %s"), GetUNID(), (LPSTR)pResult->GetStringValue());
		else if (pResult->IsSymbolTable())
			{
			int i;
			CCSymbolTable *pTable = (CCSymbolTable *)pResult;

			for (i = 0; i < pTable->GetCount(); i++)
				{
				CString sParam = pTable->GetKey(i);
				ICCItem *pValue = pTable->GetElement(i);
				CEffectParamDesc Value;

				if (pValue->IsNil())
					Value.InitNull();
				else if (pValue->IsInteger())
					Value.InitInteger(pValue->GetIntegerValue());
				else if (pValue->IsIdentifier())
					{
					CString sValue = pValue->GetStringValue();
					char *pPos = sValue.GetASCIIZPointer();

					//	If this is a color, parse it

					if (*pPos == '#')
						Value.InitColor(::LoadRGBColor(sValue));

					//	Otherwise, a string

					else
						Value.InitString(sValue);
					}

				pPainter->SetParam(Ctx, sParam, Value);
				}
			}
		else
			::kernelDebugLogMessage(CONSTLIT("EffectType %x GetParameters: Expected struct result."), GetUNID());

		CCCtx.Discard(pResult);
		}
	}

ALERROR CDesignCollection::CreateTemplateTypes (SDesignLoadCtx &Ctx)

//	CreateTemplateTypes
//
//	This is called inside of BindDesign to create all template types

	{
	ALERROR error;
	int i;

	//	Create an appropriate context for running code

	CCodeChainCtx CCCtx;

	//	Loop over all active types looking for templates.
	//	NOTE: We cannot use the type-specific arrays because they have not been
	//	set up yet (remember that we are inside of BindDesign).

	for (i = 0; i < m_AllTypes.GetCount(); i++)
		{
		CDesignType *pTemplate = m_AllTypes.GetEntry(i);
		if (pTemplate->GetType() != designTemplateType)
			continue;

		//	Get the function to generate the type source

		CString sSource;
		SEventHandlerDesc Event;
		if (pTemplate->FindEventHandler(GET_TYPE_SOURCE_EVENT, &Event))
			{
			ICCItem *pResult = CCCtx.Run(Event);
			if (pResult->IsError())
				{
				Ctx.sError = strPatternSubst(CONSTLIT("GetTypeSource (%x): %s"), pTemplate->GetUNID(), pResult->GetStringValue());
				return ERR_FAIL;
				}
			else if (pResult->IsNil())
				sSource = NULL_STR;
			else
				sSource = pResult->GetStringValue();

			CCCtx.Discard(pResult);
			}

		//	Define the type

		if (!sSource.IsBlank())
			{
			if (error = AddDynamicType(pTemplate->GetExtension(), pTemplate->GetUNID(), sSource, true, &Ctx.sError))
				return error;
			}
		}

	return NOERROR;
	}

bool CWeaponFireDesc::FireOnDamageOverlay (SDamageCtx &Ctx, CEnergyField *pOverlay)

//	FireOnDamageOverlay
//
//	Fire OnDamageOverlay event. Returns TRUE if we should skip further overlay damage

	{
	SEventHandlerDesc Event;
	if (FindEventHandler(evtOnDamageOverlay, &Event))
		{
		//	Setup arguments

		CCodeChainCtx CCCtx;

		CCCtx.SaveAndDefineSourceVar(Ctx.pObj);
		CCCtx.DefineInteger(CONSTLIT("aArmorSeg"), Ctx.iSectHit);
		CCCtx.DefineInteger(CONSTLIT("aOverlayID"), pOverlay->GetID());
		CCCtx.DefineSpaceObject(CONSTLIT("aCause"), Ctx.pCause);
		CCCtx.DefineSpaceObject(CONSTLIT("aAttacker"), Ctx.Attacker.GetObj());
		CCCtx.DefineSpaceObject(CONSTLIT("aOrderGiver"), (Ctx.Attacker.GetObj() ? Ctx.Attacker.GetObj()->GetOrderGiver(Ctx.Attacker.GetCause()) : NULL));
		CCCtx.DefineVector(CONSTLIT("aHitPos"), Ctx.vHitPos);
		CCCtx.DefineInteger(CONSTLIT("aHitDir"), Ctx.iDirection);
		CCCtx.DefineInteger(CONSTLIT("aDamageHP"), Ctx.iDamage);
		CCCtx.DefineString(CONSTLIT("aDamageType"), GetDamageShortName(Ctx.Damage.GetDamageType()));
		CCCtx.DefineItemType(CONSTLIT("aWeaponType"), Ctx.pDesc->GetWeaponType());

		ICCItem *pResult = CCCtx.Run(Event);
		if (pResult->IsError())
			Ctx.pObj->ReportEventError(ON_DAMAGE_OVERLAY_EVENT, pResult);

		//	If we return Nil, then we continue processing

		bool bResult;
		if (pResult->IsNil())
			bResult = false;

		//	Otherwise, the result is the damage left

		else
			{
			Ctx.iDamage = pResult->GetIntegerValue();
			bResult = true;
			}

		CCCtx.Discard(pResult);

		return bResult;
		}
	else
		return false;
	}

bool CWeaponFireDesc::FireOnFragment (const CDamageSource &Source, CSpaceObject *pShot, const CVector &vHitPos, CSpaceObject *pNearestObj, CSpaceObject *pTarget)

//	FireOnFragment
//
//	Event fires when a shot fragments. If we return TRUE then we skip the default
//	fragmentation event.

	{
	SEventHandlerDesc Event;
	if (FindEventHandler(evtOnFragment, &Event))
		{
		//	Setup arguments

		CCodeChainCtx CCCtx;

		CCCtx.SaveAndDefineSourceVar(pShot);
		CCCtx.DefineSpaceObject(CONSTLIT("aNearestObj"), pNearestObj);
		CCCtx.DefineSpaceObject(CONSTLIT("aTargetObj"), pTarget);
		CCCtx.DefineVector(CONSTLIT("aHitPos"), vHitPos);
		CCCtx.DefineInteger(CONSTLIT("aHitDir"), (pShot ? pShot->GetRotation() : 0));
		CCCtx.DefineItemType(CONSTLIT("aWeaponType"), GetWeaponType());
		CCCtx.DefineString(CONSTLIT("aWeaponFragment"), m_sUNID);

		CSpaceObject *pAttacker = Source.GetObj();
		CCCtx.DefineSpaceObject(CONSTLIT("aCause"), pShot);
		CCCtx.DefineSpaceObject(CONSTLIT("aAttacker"), pAttacker);
		CCCtx.DefineSpaceObject(CONSTLIT("aOrderGiver"), (pAttacker ? pAttacker->GetOrderGiver(Source.GetCause()) : NULL));

		ICCItem *pResult = CCCtx.Run(Event);
		if (pResult->IsError())
			pShot->ReportEventError(ON_FRAGMENT_EVENT, pResult);

		//	If we return Nil, then we continue processing

		bool bResult;
		if (pResult->IsNil())
			bResult = false;

		//	Otherwise, we skip fragmentation

		else
			bResult = true;

		CCCtx.Discard(pResult);

		return bResult;
		}
	else
		return false;
	}

void CArmorClass::FireOnArmorDamage (CItemCtx &ItemCtx, SDamageCtx &Ctx)

//	FireOnArmorDamage
//
//	Fires OnArmorDamage event

	{
	SEventHandlerDesc Event;
	if (FindEventHandlerArmorClass(evtOnArmorDamage, &Event))
		{
		//	Setup arguments

		CCodeChainCtx CCCtx;
		CCCtx.SaveAndDefineSourceVar(ItemCtx.GetSource());
		CCCtx.SaveAndDefineItemVar(ItemCtx);

		CCCtx.DefineInteger(CONSTLIT("aArmorHP"), Ctx.iHPLeft);
		CCCtx.DefineInteger(CONSTLIT("aArmorSeg"), Ctx.iSectHit);
		CCCtx.DefineSpaceObject(CONSTLIT("aAttacker"), Ctx.Attacker.GetObj());
		CCCtx.DefineSpaceObject(CONSTLIT("aCause"), Ctx.pCause);
		CCCtx.DefineDamageEffects(CONSTLIT("aDamageEffects"), Ctx);
		CCCtx.DefineInteger(CONSTLIT("aDamageHP"), Ctx.iDamage);
		CCCtx.DefineString(CONSTLIT("aDamageType"), GetDamageShortName(Ctx.Damage.GetDamageType()));
		CCCtx.DefineInteger(CONSTLIT("aHitDir"), Ctx.iDirection);
		CCCtx.DefineVector(CONSTLIT("aHitPos"), Ctx.vHitPos);
		CCCtx.DefineSpaceObject(CONSTLIT("aOrderGiver"), (Ctx.Attacker.GetObj() ? Ctx.Attacker.GetObj()->GetOrderGiver(Ctx.Attacker.GetCause()) : NULL));
		CCCtx.DefineItemType(CONSTLIT("aWeaponType"), Ctx.pDesc->GetWeaponType());

		ICCItem *pResult = CCCtx.Run(Event);

		//	If we return Nil, then nothing

		if (pResult->IsNil())
			NULL;

		//	If we return an integer, then this is the damage that armor should take

		else if (pResult->IsInteger())
			Ctx.iDamage = pResult->GetIntegerValue();

		//	If we return a list, then we it to be a DamageEffects list (modifications to
		//	aDamageEffects)

		else if (pResult->IsList())
			LoadDamageEffectsFromItem(pResult, Ctx);

		CCCtx.Discard(pResult);
		}
	}

void CMission::FireOnStart (void)

//	FireOnStart
//
//	Fire <OnStarted>

{
    SEventHandlerDesc Event;

    if (FindEventHandler(EVENT_ON_STARTED, &Event))
    {
        CCodeChainCtx Ctx;

        Ctx.SaveAndDefineSourceVar(this);

        ICCItem *pResult = Ctx.Run(Event);
        if (pResult->IsError())
            ReportEventError(EVENT_ON_STARTED, pResult);
        Ctx.Discard(pResult);
    }
}

void CAdventureDesc::FireOnGameStart (void)

//	FireOnGameStart
//
//	Fire OnGameStart event

{
    SEventHandlerDesc Event;

    if (FindEventHandler(ON_GAME_START_EVENT, &Event))
    {
        CCodeChainCtx Ctx;

        //	Run code

        ICCItem *pResult = Ctx.Run(Event);
        if (pResult->IsError())
            kernelDebugLogMessage("OnGameStart error: %s", pResult->GetStringValue());
        Ctx.Discard(pResult);
    }
}

void CMission::FireCustomEvent (const CString &sEvent)

//	FireCustomEvent
//
//	Fires a custom timed event

{
    SEventHandlerDesc Event;

    if (FindEventHandler(sEvent, &Event))
    {
        CCodeChainCtx Ctx;

        Ctx.SetEvent(eventDoEvent);
        Ctx.SaveAndDefineSourceVar(this);

        ICCItem *pResult = Ctx.Run(Event);
        if (pResult->IsError())
            ReportEventError(sEvent, pResult);
        Ctx.Discard(pResult);
    }
}

void CMission::FireOnSetPlayerTarget (const CString &sReason)

//	FireOnSetPlayerTarget
//
//	Fire <OnSetPlayerTarget>

{
    SEventHandlerDesc Event;

    if (FindEventHandler(EVENT_ON_SET_PLAYER_TARGET, &Event))
    {
        CCodeChainCtx Ctx;

        Ctx.SaveAndDefineSourceVar(this);
        Ctx.DefineString(STR_A_REASON, sReason);

        ICCItem *pResult = Ctx.Run(Event);
        if (pResult->IsError())
            ReportEventError(EVENT_ON_SET_PLAYER_TARGET, pResult);
        Ctx.Discard(pResult);
    }
}

void CMission::FireOnReward (ICCItem *pData)

//	FireOnReward
//
//	Fire <OnReward>

{
    SEventHandlerDesc Event;

    if (FindEventHandler(EVENT_ON_REWARD, &Event))
    {
        CCodeChainCtx Ctx;

        Ctx.SaveAndDefineSourceVar(this);
        Ctx.SaveAndDefineDataVar(pData);

        ICCItem *pResult = Ctx.Run(Event);
        if (pResult->IsError())
            ReportEventError(EVENT_ON_REWARD, pResult);
        Ctx.Discard(pResult);
    }
}